ohold on  the command superposes several plots on the same graph, even if another
script is executed (default: hold off)

ohold off  it is recommended to use this command in the end of the script, if
the command "hold on" has ever been used in the script

When several graphs are plotted,
it is better to define the limits for coordinates in advance.Otherwise, the limits will be the same as
for the first curve. All specifications such as "axis" can be hold
with the command "hold on" before the graphs are plotted on the
figure.

·figure: opens a new graphic window that is numbered consecutively from the
previous window

·figure(n): make an existing graphic window (n) the current window; if the
window (n) does not exist, the command opens a new graphic window
numbered by (n) (NB: all graphic commands apply to the current window)

·pause:
holds up execution of the script and waits for the user to press any key

·pause(s): holds up execution of the script for s seconds

·close(n): closes the graphic window (n)

·close all: closes all graphic windows

·clf:
clears everything inside the graphic window

·cla:
clears the plotted curves and redraws the axes

·figure('Position',[pix,piy,pwx,pwy]): sets the size and shape of the current
window

opix,piy  the horizontal and vertical coordinates of the left bottom corner of
the window

opwx,pwy  the number of pixels in the width and height of the window

odefault: figure('Position',[232 258 560 420])

·get(gcf): displays the properties of the current figure, such as size, location,
color map, and many others

·set(gcf,'PropertyName',PropertyArray): changes the property "PropertyName"
of the current window according to the data in PropertyArray